A'a flow from the Pu'u O'o vent of Kilauea Volcano in Hawai'i advancing down a subdivision road. Ben Talai (right) and Bob Decker watch as the flow front rapidly inflates in thickness from about 1 meter to 3 meters. When the inflation reached  5 meters, the flow began to surge forward  at a speed of about 120 meters per minute, thinning and slowing as it moved rapidly down the road. (Be sure to see next photo.)      U.S. Geological Survey photo by Jim Griggs. 

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